linux-kernel - Re: [PATCH v2 2/3] iommu/mediatek: add pdata member for legacy ivrp paddr

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Message-ID: <1583324597.4784.23.camel@mhfsdcap03>
Date:   Wed, 4 Mar 2020 20:23:17 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Fabien Parent <fparent@...libre.com>
CC:     <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>, <matthias.bgg@...il.com>,
        <ck.hu@...iatek.com>, <joro@...tes.org>, <anan.sun@...iatek.com>,
        <youlin.pei@...iatek.com>, <scott.wang@...iatek.com>
Subject: Re: [PATCH v2 2/3] iommu/mediatek: add pdata member for legacy ivrp
 paddr

On Mon, 2020-03-02 at 12:21 +0100, Fabien Parent wrote:
> Add a new platform data member in order to select which IVRP_PADDR
> format is used by an SoC.
> 
> Signed-off-by: Fabien Parent <fparent@...libre.com>
> ---
> 
> v2: new patch
> 
> ---
>  drivers/iommu/mtk_iommu.c | 3 ++-
>  drivers/iommu/mtk_iommu.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 95945f467c03..78cb14ab7dd0 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -569,7 +569,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  		F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
>  	writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
>  
> -	if (data->plat_data->m4u_plat == M4U_MT8173)
> +	if (data->plat_data->has_legacy_ivrp_paddr)
>  		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
>  	else
>  		regval = lower_32_bits(data->protect_base) |
> @@ -786,6 +786,7 @@ static const struct mtk_iommu_plat_data mt8173_data = {
>  	.m4u_plat     = M4U_MT8173,
>  	.has_4gb_mode = true,
>  	.has_bclk     = true,
> +	.has_legacy_ivrp_paddr = true;
>  	.reset_axi    = true,
>  	.larbid_remap = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */
>  };
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index ea949a324e33..4696ba027a71 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -42,6 +42,7 @@ struct mtk_iommu_plat_data {
>  	bool                has_bclk;
>  	bool                has_vld_pa_rng;
>  	bool                reset_axi;
> +	bool                has_legacy_ivrp_paddr;

I'd like to put this before "has_vld_pa_rng" alphabetically.

Other than this,

Reviewed-by: Yong Wu <yong.wu@...iatek.com>

>  	unsigned char       larbid_remap[MTK_LARB_NR_MAX];
>  };
>